Why isn't there full disclosure?
He suffered a "Lower Leg" injury. Was it to his left or right leg? Is it to the leg he missed time with last year due to a "Lower Leg" injury that was deemed an injury to his calf? If so, could this be a reoccurring injury that warrants bigger concerns?
If he had fractured or broken a bone in his leg one would expect that the disclosure would have said so and maybe included other language such as undergoing X-rays. I'm not an expert on Orthopedic injury terms to the "Lower Leg" but short of it being some type of fracture or break I'm wondering what it could be other than something to do with his calf.
I expect a more detailed explanation is forthcoming soon. Of course, we should all wish and hope for JJ to fully recover in time for the regular season if not before then. Bless you brother!